php_training_day4_loops

<?php
/*
Loops
To do repetitive tasks.
To run block of code certain time until condition meets.

Types of Loops
1. While Loop
    Loops through a block of code until condition is evaluated to true.
2. Do While Loop
    The block of code executed once and then condition is evaluated. If condition is true, the statement is repeated as long as the specified condition is true
3. For Loop
    Loops through a block of code until the counter reaches a specified number
4. Foreach Loop
    Loops through a block of code for each element in an array.
    */

// PHP WHILE LOOP
// Syntax
// while (condition) {
//  code to be executed
// }

$i = 1;
while ($i <= 3) {
    echo $i . '<br />';
    $i++;
}

echo '<br /><br /><br />';

/* PHP DO WHILE LOOP
Syntax:
do {
    code to be executed
}
while (condition)
*/

$i = 1;
do {
    echo $i . '<br />';
    $i++;
}
while ($i <= 10);

echo '<br /><br /><br />';

/*
FOR LOOP
Syntax:
for (initialization; condition; increment) {
    code to be executed
}
*/
for ($i = 10; $i >= 1; $i--) {
    echo 'The number is ' . $i . '<br />';
}

echo '<br /><br /><br />';

/* FOREACH LOOP
syntax:
indexed array
foreach ($array as $value) {
    code to be executed
}

associative array
foreach $array as $key => $value) {
    code to be executed
}
*/

$colors = array('Green', 'Blue', 'Red', 'White', 'Orange');
foreach ($colors as $color) {
    echo 'The color is ' . $color . '<br />';
}

echo '<br /><br /><br />';

$superhero = array(
    'name'      => 'Peter Parker',
    'email'     => '[email protected]',
    'age'       => 48
);

foreach ($superhero as $key => $value) {
    echo $key . ' : ' . $value . '<br />';
}

echo '<br /><br /><br />';

$superhero = array(
    'spider-name' => array(
        'name'  => 'Clark Kent',
        'email' => '[email protected]'
    ),
    'super-man' => array(
        'name' => 'Peter Parker',
        'email' => '[email protected]'
    ),
    'iron-man' => array(
        'name' => 'Harry Potter',
        'email' => '[email protected]'
    )
);

$keys = array_keys($superhero);
for ($i = 0; $i < count($superhero); $i++) {
    echo $keys[$i] . '{<br />';
    foreach($superhero[$keys[$i]] as $key => $value) {
        echo $key . ' : ' . $value . '<br />';
    }
    echo '}<br />';
}

$i = 0;
echo $i;
$i++